Define a function:

- Indent the lines of code before the definition to indicate that they are part of the function

- Functions are useful because you can cause a group of code to be executed multiple times simply by calling the function each time

Call a function:

- This will execute the code within the function that you defined with the name 'myFunc'

Pass values (parameters) to the function:

- The parameters num1 and num2 are treated as variables within the function

- The first value passed in the function call will be the value of the first parameter named in the function definition (num1 will be 312 in this case)

- If you pass a variable as a parameter to a function, any changes made to that variable will not continue after the function has ended (unless it is a mutable type such as a List or Dictionary)

- Parameters can be assigned a default value in case no value is passed in the function call. Just assign a value when naming the parameter, e.g. num2 = 22

- A parameter can be made to accept multiple values as input. Just put an asterisk '*' before the parameter name

Have the function generate a value:

- This will replace the function call with number 5, of course you will more likely return a calculated value

- You can return any data type you want

Add a function description:

- The description can then be displayed if you use the help() function with the function name as a parameter

- This is useful for others so they can get a description of how to use your function